How do you instruct a computer to do tasks?

Write a program?

Program : 
            • is a set of step-by-step instructions written to perform a specific task… 
            • Program consist of a set of instructions that are executed by the computer 

This process of writing programs is called programming.

These programs are written by a programmer.

A set of rules that tell a computer what operations to perform are called programming language. In other words, we can call this program Software.